艉轴转速表||electric propeller shaft revolution indicator receiver 声力电话机||sound powered telephone 共电式电话机||common battery telephone ..
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sound-powered telephone 声力电话 ; [通信] 声能电话机
sound powered telephone set 声力电话机 ; 无电池电话
sound-powered telephone system 声力电话系统
repeater sound-powered telephone 增音式声动电话机
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